. Cryptogamic plants of the USSR. (Flora sporovykh rastenii SSSR). Plants. and Tumi rivers (Figure 14). Characteristic of this complex is the greater amount of Distephanus crux (Ehr.) Hack. var. crux and D. specu- lum var. c a nnop ilo id e s (Pr. - Lavr.) Gleser in comparison with the remaining, less numerous Dictyocha fibula Ehr. var. fibula f. fibula, Distephanus speculum (Ehr.) Hack. var. speculum, var. pentagonus Lemm. and var. septenarius (Ehr.) Jorg., D. japonicus f. pseudofibula (Schulz) Gleser, Cannopilus hemi- sphaericus (Ehr.) Hack, and Mesocena stellata Hack. The most abundant form
. Cryptogamic plants of the USSR. (Flora sporovykh rastenii SSSR). Plants. and Tumi rivers (Figure 14). Characteristic of this complex is the greater amount of Distephanus crux (Ehr.) Hack. var. crux and D. specu- lum var. c a nnop ilo id e s (Pr. - Lavr.) Gleser in comparison with the remaining, less numerous Dictyocha fibula Ehr. var. fibula f. fibula, Distephanus speculum (Ehr.) Hack. var. speculum, var. pentagonus Lemm. and var. septenarius (Ehr.) Jorg., D. japonicus f. pseudofibula (Schulz) Gleser, Cannopilus hemi- sphaericus (Ehr.) Hack, and Mesocena stellata Hack. The most abundant form on the northerncoast of the Shmidt peninsula is Distephanus crux (Ehr.) Hack. var. crux; D. speculum var. c an no p il o id e s () Gleser occupies the second place. In the basin of the Kongi and Tumi rivers this relationship is sometimes reversed. Moreover, D. speculum (Ehr.) Hack. var. speculum appears in slightly larger quantities in the latter FIGURE 14. Characteristic silicoflagellate complex of the Neogene of northern Sakhalin (older complex): 1 —3 — D i s t e ph a n u s speculum var. cannopiloides () Gleser; 4 — 6 — D. crux (Ehr,) Hack. var. crux; 7—Mesocena stellata Hack. 197 This complex is comparable with the Middle Miocene silicoflagellate complex of the Calvert formation of the state of Maryland. Indeed, the proportion between D. crux (Ehr.) Hack, and D. speculum var. cannopiloides () Gleser is almost the same in these com- plexes. Moreover, these elements of the Sakhalin and Maryland floras are morphologically identical. The abundance of D. crux (Ehr.) Hack. var. crux suggests a relation- ship between the above Sakhalin flora and the Late Miocene flora of the area of Hokuriku of Honshu Island (Japan), where D. crux (Ehr.) Hack, predominates (Ichikawa, 1956). However, the Sakhalin flora is more closely related to that of Maryland. 211. Please note that these images are extracted from scanned page images that may have b
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